Updated regexp for recipient_email to support multiple email addresses.
Updated regexp for recipient_email to support multiple email addresses.

Vakrim/spree_email_to_friend,Vakrim/spree_email_to_friend,spree-contrib/spree_email_to_friend,Hates/spree_email_to_friend,com123/spree_email_to_friend,Vakrim/spree_email_to_friend,spree-contrib/spree_email_to_friend,spree-contrib/spree_email_to_friend,ReserveBar1/spree_email_to_friend